* {
  box-sizing: border-box;
}

body {
  font-family: "Open Sans", sans-serif;
  background: #222;
  color: #bbb;
  margin: 50px 0 0 0;
}

.body-nested {
  margin: 100px 0 0 0;
}

.anchor {
  padding: 100px 0 0 0;
}

.flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.grid {
  display: grid;
  margin: auto 8px;
}

ul {
  padding-left: 20px;
}

ol.content-list {
  padding-left: 28px;
  height: min-content;
}

img {
  max-width: 100%;
  display: block;
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: start;
}

a {
  color: #337ab7;
  text-decoration: none;
}

a:hover {
  color: #23527c;
  text-decoration: underline;
}

ul.code {
  list-style: none;
  padding: 0;
}

/* navbar, fixed at top of window */
.navbar {
  position: fixed;
  top: 0;
  height: 50px;
  width: 100%;
  z-index: 1000;
  background: #333;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid black;
}

.navbar-nested {
  top: 50px;
}

/* menu buttons for navbar */
.menu {
  height: 100%;
}

.menuitem {
  height: 100%;
  padding: 0 8px;
}

a.menuitem {
  color: #bbb;
  text-decoration: none;
}

.menuitem:hover {
  background: #666;
}

.menuitem-active {
  background: #111;
}

/* boxes for content structuring */
.highlight {
  background: #333;
  padding: 6px 12px;
  margin: 6px 0;
  border-radius: 4px;
}

.highlight-nested {
  background: #222;
}

a.highlight {
  color: #bbb;
  text-decoration: none;
}

.highlight-button:hover {
  background: #666;
}

/* fragmented highlights on gui page */
.gui-text {
  margin: 0 0 6px 0;
  border-radius: 0 0 4px 4px;
}

.gui-head {
  margin: 6px 0 0 0;
  border-radius: 4px 4px 0 0;
}

.gui-image {
  margin: 0;
  border-radius: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: min-content 1fr;
  }

  .content-list {
    grid-row: 1 / 4;
    position: sticky;
    width: 250px;
    top: 118px;
  }

  .content-text,
  .content-image {
    grid-column-start: 2;
  }
}

@media (min-width: 1200px) {
  .grid {
    grid-template-columns: minmax(min-content, 1fr) minmax(auto, 960px) minmax(min-content, 1fr);
  }

  .content-image {
    grid-column-start: 3;
    grid-row: auto / span 2;
    align-self: center;
    min-width: 400px;
  }

  .gui-head {
    border-top-right-radius: 0;
  }

  .gui-text {
    border-bottom-right-radius: 0;
  }

  .gui-image {
    flex-direction: row;
    align-self: auto;
    justify-self: left;
    margin: 6px 0;
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
  }

  .gui-image > img {
    max-height: 80%;
  }
}

/* classes for highlighting part of an image */
.overlay-container {
  position: relative;
}

.img-overlay {
  position: absolute;
  border: solid 1px red;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: black 0 0 5px;
}

.img-overlay > * {
  display: none;
}

.img-overlay:hover {
  color: red;
  background: #f001;
  text-decoration: none;
  z-index: 100;
}

.img-overlay:hover > * {
  display: block;
}
